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#! /usr/bin/perl -w
my $prefix = $ENV{"NIX"} || "/nix"; # !!! use prefix
my $linkdir = "$prefix/var/nix/links";
my %alive;
open HASHES, "nix closure \$(cat $linkdir/*.hash) |";
while (<HASHES>) {
chomp;
$alive{$_} = 1;
}
close HASHES;
open HASHES, "nix listinst |";
while (<HASHES>) {
chomp;
if (!$alive{$_}) {
print "$_\n";
}
}
close HASHES;
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